What best practice should be followed when constructing SQL queries in PHP to avoid errors?

When constructing SQL queries in PHP, it is important to use prepared statements to prevent SQL injection attacks and avoid errors. Prepared statements separate the SQL query from the user input, ensuring that input is treated as data rather than executable code. 

// Establish a database connection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL statement with placeholders
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind parameters to the placeholders
$stmt->bindParam(':username', $username);

// Execute the query
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll();

Keywords

SQL injection prepared statements PDO mysqli error handling

Related Questions